Door lock



June 25, 1929. J, W, lDODD 1,718,456

DOOR LOCK Filed NOV. l2, 1926 2 Sheets-Sheet l IWI/anime' June 25, 1929.

.1. w. DOOD 1,718,456

192e 2 sheets-sheet 2 fwn/@M- ff fm Malati.

Patented June 25, 1929.

UNITED STATES PATENT OFFICE.

JOHN W. DODD, F BROOKLINE` MASSACHUSETJ?S7 ASSIGNOR T0 GEORGE T. MCLAUTH- LIN COMPANY, 0F BOSTON, MASSACHUSETTS, .A CORPORATION OF RHODE ISLAND.

DOOR LOCK.

Application led November 12, 1926.

'l'his invention relates to door locks. more particular-l),Y intended Vt'or use in connection with the doors of elevator shafts. though cerlain features ot the invention might be applicable to doors in other locations. In order to prevent accidents the doors leading to an elevator shaft normally should be sluit :rnd locked except when the elevator car is sationaif.v opposite a door opening. whereupon the door for thatl opening onlj.Y should he releasable so that it mav be opened.

It iuld. however` be possible tor an authorl person. such as an inspector or repairiua n, to have access to the shaft through a door opening` quite regardless o't` the position ot the ear. A lock particularlj7 design to accomplish these ends is disclosed and @aimed in Patent No. 1.595.555) granted to Martin l5. lp-leliaiuhlin on August l0. 1926, for elevator' shalt door lock.

The present invention in certain respects is an improvement over the Mcliauthlin con truetion One o" the objects of the present invent ion is to simplify the lock construetimi, rendering it more rugged and avoiding the necessity ol'Y using springs.

tui-ther object is to provide such a lock readilv adaptable to either right hand or left ha ud slidii'ig or s. Yinging doors.

il. still further object is to provide such a lock wherein the parts lna'v be assembled or an assembly already made ma)Y be readily changed to meet the particular ehanges pre,- sented in the various door arrangements and without the use ot special tools.

For a more complete understanding of this invention. reference mav be had to the accompanving drawings in which i Figure 1 is a traglnmitar)Y vertical Isection through an elevator shaft showing' in elevation a lot-kine' mechanism iny connection with a ,sliding door.

Figure 2 is a vertical section at right an- ;ies to Figure 1 and showing a portion ot the elevator car.

Figure il is a vieuv similar to Figure but showing the application o'f a n'ieehanism in connection With a swinging door.

Figure 4 is a. View to a larger scale oit a portion of the mechanism. the cover plate being removed. l

Figure 5 is a view similar to Figure Ll but showing the parts in door released position.

Figure 6 is a section on line (f ot Fig ure 5.

lim(

Serial No. 147,924.

Figure 7 is a 'fragmentary view similar to a. portion of Figure 5 but showing they positions of the parts when the door handle or knob is turned and the car is not opposite the door opening.

Fi eure 8 is a detail section on line 8-8 of Figure 4.

Figure 9 is an elevation of the latch plate secured to the door.

Figure 10 is a view somewhat similar to Figure 17 but showing a door movable in the opposite direction to open and close from that shown in Figure 1.

Figure 11 is a vertical section at right angles to Figure 10.

Figure 12 is an elevation somewhat similar to Figure lbut arranged for a sliding door closing in the opposite direction and showing a modified t'orm of door Contact member.

Figure 13 is a vfraginentary section on line 13-13 ot' Figure 12.

Figure 111 is a detail section on line 14-14 oi Figure 7.

Figure 15 is a view somewhat similar to Figure 4 but with certain parts differently connected.

Figure 16 is a detail perspective.

Figure 17 is a horizontal section through a portion of the elevator shaft showing the kev release mechanism tor use with a sliding door.

Figure 18 is a detail elevation showing a. portion of the same mechanism.

Referring lirst to Figures 1 and 2, at 1 is shown a door for closing a door opening to an elevator shaft, portions ofthe frame of this doorway being shown at 2 and 3. A portion ot a car in said shaft is shown at 4. The shaft door 1 is shown in these figures as a sliding door moving between spaced guides 5 and 6 carried by the door easing member 2. T0 the casing member 3 of this doorway is attached, as b v brackets 8 and 9, a casing 10 which contains certain movable parts of the locking mechanism which Will be hereinafter described. This easing has a normally open side at 11. and a cover 12 closes this side when the door is closed, this cover 12 being carried hv the door. a suitable bracket member 13 tixed to the inner tace ofthe door being shown as supporting this cover in position. Beneath the casing 10 the door 1 is shown as provided with a rock shaft 15 extending therethrough and having a knob 16 fixed to its outer end on the outside of the door by Which at t) it may be turned. A similar knob 17 is shown as lixed at the inner end of this shaft but this may be omitted it desired. Carried b v the rock sha't't 15, as shown best in Figure 1, is a rock arm 18 supported within a box eiementor housingy 19, and extending' into this housing. resting' on the end portion of the arm 18 is the lower end ot a plunger rod 2t) slidablv guided l'or axial vertical movementv through the guide shown at 2l carried bv the door, The upper end of this plunger rod is guided through an opening` 22 in the inwardly turned lower end 23 of the cover 12. this being' shown in Figures l and The arm 1S is normally held in substantially horizontal position by anT suitable means, but may be rocked upwardly by manipulation otl either of the knobs 16 or 17 to raise the plunger tor a purpose which will later appear.

Referring' now to Figures 4, 5, and el. it will be seen that the casing; 10 comprises a frame portion having' an upper wall 25, a vertical end wall 26 opposite to the open side 1l and a bottom short wall portion 27 toward which the inturned portion 23 oi the cover l2 approaches when the cover is in door closed position. Opposite sides of the trame inem-- ber comprisinl these three walls maybe closed oti by means ot removable cover plates lo and 31. These eover plates are interchangeabl v engageable on opposite sides of the frame for a purpose which will later appear. The;Y ma)Y be lined in place by suitable means sueh as screws as shown at in Figure l, these screws being;V threaded into the frame. Certain otl the screw openings in the trame maj.' extend entirel)Y through the trame, as shown for example at 37 and these are countersunhV on both sides of the frame and are intended to receive long' bolts which may extend therethrough and tix the easing to the shaft with certain door arrangements, this however being unnecessary when the casing' mounted tor a sliding door as shown in Figure 1. These screw holes at 37 are eountersunk at opposite sides so that the casing' may be fixed either side out with the covers 30 and 31 interehanged will later appear. The frame wall is provided with an inwardly extending' lug 40 on opposite sides ot which is pivoted through spaced bosses A'11 thereon a latch member l2 having a latch lip 43 adiacent to its free end. This latch member is preterabl)v formed somewhat box shaped with a stitieningr rib ist extendingr thereacross. At opposite sides this latch member is shown as provided with downwardly extending' i'ianges l5 and 1G. Between these flanges is passed a pivot pin -glT on which is pivoted a guide rod 18. The lower end of this rod is formed ot circular cross section at 49 and is slidablv guided through either one of a pair of holes 50 in the wall member 27. this beine` shown best in Figure 16. The pivot 47 comprises a straight pin or bar of uniform diameter throughout which extends through the flanges 45 and 4G and heid assembled therein by means ot the cover members lo and $31 of the casing between which it wholl'vv lies, beim: held against undue endwise movement by engagement ot its ends iih the inner tlat 'taires of the cover nlenihef.- oetween which it has tlezitinp bo-.iilv movement haviiof no lifted suppoi ,i The casino' walls. therefore. aci to restrain thi', i in against undue endwise movenient only. rl`he easir' walls and the elenrrnts pivotallhv eoniuwted are thus the only portions oi the ioel( with which the pivots contat-t. The member le, provided on one side with a lr 52 which extends within a socliet portion 51o in a bell eranl: lever :7i-t, this lug being' pivoted within the socket portion on a pin 55 lassiini' therethrough. This pin 35 also I ni-"tii'ablv ex'teinis adjacent to and is held in ainhled position with relation to the bell. eruit; lever and the lug 52 by the cove' plato#y ltl and lll. similarly to the pivot pin l?. (lne arin ot this hell crank lever il is toi-nie: eloinfated as at 56. this elongated portion heine' peri'oratml for the reeeption ot a pivot nin 57 on which is suspended an abutment member this member beine' shown as torined U pe, the pivot ,mssingtln'e1-h the end portions ol its opp'i-i'elv disposed arios. and its central transversely extending portion Tit) being' poi-ilioned above the upper end of the plunger rod 2t) when the door is in closed position.

YWhen the door is a sliding' door. as shown in Fif'ures l and 2. the t iin.r also earries ioni'nard in tlze wall 2o a roel( shaft (i0. This rock what? e. ends adiacent to the upstandine' end wall t l ot the wail portion 27 and is pieren-ed tgom endwise movement in one direction b v this end wall. lt has pinned thereto adjacent to a bear' s oil on the wall 26 through which it i a coilar till which prevents eiidwise 1n., on ot this shai't in the opposite direction. This collar is extended on one side and has a pin 55 extending therefrom which projects between a pair ot pins tt tixed to a roel: arm o7 iournaied on a pivot shait {it} tiXed to an ear (Si) integral with the walls 2o and 27 at their adjoining corner. This rock arm (37 has pivoted at its upper end a pair of links 7() pivoted on pin 7l. these links also pai-sing one on each side ot the guide rod 18 and being pivoted at 72 to another arm 721 ot the hell cranit lever 54.

Outwardljv o t tle easing lt) the roel; shai't t3() has fixed thereto an a rm 75 to the treo end o," which is fixed a suitable element which malv be projected into the path ot movement of the car when the ear is not in position opposite to the. doorway and whirh will be stopped h v impin} ;jemen' on a portion oi the rar should it he opposite to the doorwa)7 whenever the rock sha'tt (itl is rocked in the proper direction. The cover member 12 provided with a latth element Sti having an i i i lll) site side of the doorway troni that shown in Figure, 1, the rock shaft then being positioned on the opposite side ot' the rock arm t?? and through the opening;r shown at but) t Fig'- uresl t5 and 16).

Since the arm tixed adjacent to the side ot the doorway toward which .he door closes. the showing of Figures 1. c. l. I: and t3 would be reyers'ed as in Figures 112 and l when the door closes in the opposite dire so that it the shaft (it) and the arm TLS lett inthe saine relationship as shown in ure 1, they would be rocked in the wi-ooe' direction by turning et the knob. vWhen the parts are positioned for door moving' in reverse direction to that shown by l `i5ure i. therefore the rock sha l't o() is; arrangg'eft a.- shown in Figures 12 and l?, on the opposite side olI the rock arm (Si with the pin eufL ing' between the opposite ends oij 4die pins t so that the direction of nio'. 'on ot the a rm To is as it should be-` and the spacing' trom the hier of the rock shalt (t) carrying the urin if). the same as in the arrangement shown in Fit;- ure 1.

ln some cases it may be desirable to have, the arm 75 extend downwardly instead o1" upwardly and for this reason the bell crank lever 54 has been shown with an extension beneath the socket portion o?, as at llt), this extension being: shown as provided with an opening 111 through which the pivot pin Yt'or the links 7() may be passed. as shown tor example in Figure 15. hockine` ot the bell crank lever by raising ot' the abutment i iemlaer will thus act to move these links in the opposite direction, thus to rock the shatt- (t) in the opposite direction so as to permit the arm T5 to more toward the car path by the opposite direction ot rocking'.

lt is also sometimes desirable that the electric current supply tor the motor which actuates the car shall be interrupted when any ot' the doors are opened. Villiere this is desirable a suitable switch mechanism may he provided. As shown this switch mechanism con'iprisefli. a cimductin;` plate 120 set in a block ot insulation 121 carried on the, door corer 1Q. this when the door is closed and rocked bridging a pair of' spring contact members These members 122 are shown as supported on pins 12B. these pins being surrounded by springs 124 bearing4 on the contact members and holdin;` them in close engagement with the terminal strips 125 to which the power cables 126 are attached. The spring contacts 122 are shown as proyidcd with down vard bends 12T which are contacted by and raised when the latch member 42 is raised to release the door. Thus the electrical connection between the contacts 122 through the bridge member 120 is broken so that current can no longer pass. 1t will be seen that tor the latch mechanism itself n0 springs are required to hold the parts in operative relation. all the mechaisms acting` by gravity and that whenever the knob is turned the door may not be released unless the car is in proper position opp-:site the doorway.

fhile it is not desirable that the door .Janld be openable under normal conditions, e-gcept when the ear is opposite the doorway7 helegs. it is often desirable that an n tor. repairnian. or other qualitied or aiu-iorized person, be able to open the door at anytime. )t mechanism suitable vtoractuation to release the door at any time when the door is mounted to slide is shown in Figures il' and lo.

lteterrineI to these figures it will be seen that the latch element tt) has a lateral pei-toraiion wherein is journaled a rock shaft 150. lfixcd to the inner end ot this rock shaft is `:itch release tingfer 151.r having;` its tree end cndin beneath the latch lip 423, a stop pin tif the element t), preventingr the tanger treni dropping to vertical position.

iositc end ot rock shaft extends ioie through the door 1, and is sonar ed or otherwise tormed tor engagement ty a k 15h with which a person authorized io open he door at any time is provided. By if this key the rock shat't 150 may be tui nef. to cause the release, tin; a' 151to raise lxe latfyh so as to release the door at any time .ieg-ardiess ot the position ot' the car.

l'i'hcre the door is mounted to swing'. it may be provided with a pertoration registering* with a perforation (lt`igure T) through the cover member 12. so that a beveled ended 'releasing member. shown dotted at 161, may be passed therethrough and pushed under the latch lip 43, to raise the latch member and thns release the door.

4ii'hile the casing l() is shown as provided with rai-ions holes through `which parts may he passed selectively, dependingr upon the door mounting'. where the particular door mounting' for which an installation as intended is known. the mechanism may be made up tfor that mounting alone. thus savingr the labor et termine' the holes which will not` be required and perhaps improving the appearance ot the mechanism as installed. The .same general mechanism is. howeyer. readily annpted yto various door mountings by a simple rearraoo'ement of parts, so that manufact are reduced.

iyinr thus described an embodin'ient ot invention it should be evident, to those flip-led in the art` that various changes and nsiditcations might be made without departine troni its spirit or scope as delined by the appended claims.

1 claim: l n combination. a lasino,l comprisingt waits a ud a latch piroted in said casing. and mechanism actuable under certain conditions onlyV to more said latch, said mechanism comhc opl into a l thm llt)

prising pivotally connected elements, the pivots for certain of said elements being bodily movable with reference to said casing and comprising rods lying entirely between said walls and retained in position thereby.

2. In combination with a shaft having a door opening, a door for closing said opening, and a car in said shaft, of a casing, a latch member in said casing, a latch member` on said door, means for fixing said casing to said shaft in any of a plurality of relations to permit cooperation of said latch members to hold the door closed whether said door be mounted to swing or slide, a rock shaft mounted in said casing and extending outwardly thereof in any selected gne of a plurality of directions, the direction' selected being in accordance with the mounting of said casing relative to said shaft, a lever fixed to the projecting portionof said rock shaft being movable toward and from the path of said car as said shaft is rocked, and means actuable when said door is closed to rock said shaft to bring the free end of said lever toward said path when said car is not opposite to said doorway, and to bring said free end toward said car to be stopped thereby and thereafter to 1 'elease said latch members when the car is op-v posite to said doorway.

3. The combination with a shaft having a doorway, and a door for closing said doorway,

a casing for attachment to said shaft, said casing having an open side, a latch member in said casing, a cover for attachment to said door, said cover bridging said open side when said door is closed and having a latch element engaging said latch member when said door is closed for holding said door closed, a rock shaft extending outside of said casing, an arm fulcrumed within said casing, operative connections between said arm and shaft whereby rocking of said arm rocks said shaft, a lever pivotally connected to said latch member, a link connectin said arm and lever, and a member mova le relatively to said cover and operatively related to said lever to rock said lever and thus rock said rock shaft when said rock shaft is permitted to rock, and to move said lever bodily to release said latch members when said rock shaft is held from rocking.

4. The combination with a shaft having a doorway, a door for closing said doorway, and a car in said shaft, of a casing fixed to said shaft, a rock shaft carried by said casing, an arm on said rock shaft having its free end movable toward and from the path of said car, a latch member pivoted in said casing, a. latch element carried by said door and cooperating with said latch member when said door is closed to hold said door closed, a rod pivoted to said latch and slidably guided in said casing, a bell crank lever pivoted to said rod, and an abutment member pivotally suspended from one arm of said bell crank lever, a rock arm operatively related to said rock shaft, a link connecting said arm to the other arm of said lever, a plunger slidably carried by said door in position to strike and raise said abutment member when said door is closed, the raising of said abutment acting to swing said sha-ft arm when said car is not opposite to said doorway and acting to release said latch member when said car is o posite to said doorway, and means accessib e externally of said door for raising said sliding plunger to impinge on and raise said abutment member. K

5. The combination with a shaft having a doorway, a door for closing said doorway,

and a car in said shaft, of a casing fixed to said shaft, a rock shaft carried by said casing, an arm on said rock shaft having its free end movable toward and from the path of said car, a latch member pivoted in said casing, a latch element carried by said door and cooperating with said latch member when said door is closed to hold said door closed, a rod pivoted to said latch and slidably guided in said casing, a bell crank lever pivoted to said rod, and an abutment member pivotall suspended from one arm of said bell cran: lever, a rock arm operatively related to said rock shaft, a link connecting said rock arm to the other arm of said bell crank lever, a plunger slidably carried by said door in position to strike and raise said abutment member when said door is closed, the raising of said abutment acting to swing said shaft arm when said car is not opposite to said doorway and acting to release said latch member when said car is opposite to said doorway, said door having an opening through which a latch releasing member may be passed from outside of said shaft and into position to release said latch member from said element.

6. A device of the class described comprising, in combination, a casing, a latch carried by said casing, and mechanism actuable to move said latch comprising pivotally connected elements, said casing having opposed walls at opposite ends of certain of the pivots of said elements retaining said pivots against undue endwise motion only and with said elements constituting the sole portions of said device with which said pivots contact.

In testimony whereof I have affixed my signature.

JOHN W. DODD. 

